Question

In the formula that gives the circumference of a circle, which quantity is multiplied by 2Ï€ ?

A. Diameter
B. Radius
C. Area
D. Circumference

Answer 1

The circumference of an object is the total length of the line that forms the object. For a circle, the formula is:

C = 2 π r

We can see that in the formula, what is multiplied by 2 π is the radius (r).

Therefore the answer to this is

B. Radius